const theDiameter = (radius) => {
  return 2 * radius
}

const theCircumference = (radius) => {
  return 2 * radius * Math.PI
}

const theArea = (radius) => {
  return Math.PI * radius * radius
}


module.exports = {
  diamete: (radius) => {
    return theDiameter(radius)
  },
  circumference: (radius) => {
    return theCircumference(radius)
  },
  area: (radius) => {
    return theArea(radius)
  }
}

console.log(module);
